Patent priority

If the invention-creation contents of patent applications A and B are exactly the same, because B has claimed the domestic priority of A, application B can no longer be used as the priority basis of other subsequent domestic applications, that is, the priority of B can no longer be claimed (to avoid the cumulative priority exceeding 12 months);

There are two ways to apply for a patent abroad for domestic priority: 1. Paris convention, and member countries enjoy the priority of 12 months, that is, when member countries apply for patents, they can claim the priority of domestic applications for a period of 12 months; 2.PCT (Patent Cooperation Treaty) means that after filing an international application, you can enjoy the priority equivalent to 30 months after entering the national phase.

If the invention-creation contents of patent applications A and B are the same, A and the parts different from A can be used as the basis of priority, that is, A can claim the filing date of A, or B can claim the filing date of B.

Assuming that the inventions of patent applications A, B and C are all identical,

A is an earlier application;

B can claim the priority of A within 12 months after the filing date of A, that is, the filing date of B to A;

C can claim the priority of A within 12 months after the application date of A, that is, the application date of C for A;

If application B has claimed the priority of A, application C can no longer claim the priority of B and the priority period of 12 months after the application date of B, that is to say, application B with claimed priority has no priority itself;

If application B does not claim the priority of A, application C can claim the priority of B and the priority period of 12 months after the application date of B. ..

Is this ok?